Handy things for Heroku

Gemfile

@@ -25,3 +25,7 @@ group :development, :test do
   gem "pry-rails"
   gem "rspec-rails", "~> 2.14"
 end
+
+group :production do
+  gem "rails_12factor"
+end

Gemfile.lock

@@ -119,6 +119,11 @@ GEM
       bundler (>= 1.3.0, < 2.0)
       railties (= 4.0.3)
       sprockets-rails (~> 2.0.0)
+    rails_12factor (0.0.2)
+      rails_serve_static_assets
+      rails_stdout_logging
+    rails_serve_static_assets (0.0.2)
+    rails_stdout_logging (0.0.3)
     railties (4.0.3)
       actionpack (= 4.0.3)
       activesupport (= 4.0.3)
@@ -198,5 +203,6 @@ DEPENDENCIES
   pry-rails
   puma (~> 2.7)
   rails (~> 4.0.3)
+  rails_12factor
   rspec-rails (~> 2.14)
   twitter (~> 5.7)

config/application.rb

@@ -1,4 +1,6 @@
-require File.expand_path('../boot', __FILE__)
+require File.expand_path("../boot", __FILE__)
+
+require File.expand_path("../../lib/conditional_deflater", __FILE__)
 
 # Pick the frameworks you want:
 require "active_record/railtie"
@@ -30,5 +32,9 @@ class Application < Rails::Application
     config.i18n.enforce_available_locales = true
 
     config.middleware.insert_after ActionDispatch::ParamsParser, ActionDispatch::XmlParamsParser
+    config.middleware.use ConditionalDeflater do |env|
+      # Don't gzip streaming endpoints
+      env["PATH_INFO"] !~ %r(^/room/\d+/live)
+    end
   end
 end

lib/conditional_deflater.rb

@@ -0,0 +1,16 @@
+require "rack/deflater"
+
+class ConditionalDeflater
+  def initialize(app, &condition)
+    @app, @condition = app, condition
+    @deflater = Rack::Deflater.new(app)
+  end
+
+  def call(env)
+    if @condition && @condition.call(env)
+      @deflater.call(env)
+    else
+      @app.call(env)
+    end
+  end
+end